Apparatus for bending a curled metal edge around a reinforcing wire



Sept. 6, 1949. E. M. HUNT 2,480,860 APPARATUS FOR BENDING A CURLED METALEDGE AROUND A REINFORCING WIRE Filed June 50, 1945 3 Sheets-Sheet I i l\e |s INVENTOR F|6. g EVERETT M. HUNT ATTORNEY Sept. 6, 1949. E. M. HUNT2,430,850

APPARATUS FOR BENDING A CURLED METAL EDGE AROUND A REINFORCING WIREFiled June so, 1945 3 Sheets -Sheet 2 FIG. 3.

63 32- W /1 WA y k\\\ 62 6| 69 I FIG. 5. 32

I Z {O I 58 3| v L INVENTOR L EVERETT M.,HUNT

40.7 I BY W I [AA-J ATTORNEY p 1949. E. M. HUNT APPARATUS FOR BENDING ACURLED METAL EDGE AROUND A REINFORCING WIRE 3 Sheets-Sheet 3 Filed June50, 1945 FIG. 6.

FIG.

INVENTOR EVERETT I M. HUNT ATTORNEY Patented Sept. 6, 1949 APPARATUS FORBENDING A CURLED OFFI E METAL EDGE AROUND A REINFORC- ING WIRE EverettM. Hunt, Portsmouth, N. H.

Application June 30, 1945, Serial No. 602,637

(01.153-39) 7 (Granted under the act of March 3, 1883, as

6 Claims.

amended April 30, 1928; 370 0. G. 757) My invention relates to a formingmachine. It has to do, more particularly, with a machine for bending theedge of a relatively thin section of metal around a reinforcing wire orrod of metal.

In producing metal articles from relatively thin sections of metal, itisdesirable to incorporate in the edge of the metal section, areinforcing wire or rod of metal. To do this, it is necessary to bendthe edge of the metal section around the reinforcing wire associatedtherewith so that the wire will be retained firmly in position.

The object of my invention is to provide a simple machine which is veryefiective to form the edge of a relatively thin metal section around areinforcing metal wire which is associated therev I 1 The embodiment ofmy invention disclosed in this application comprises a machine which isadapted to bend the edge of the flange or sidewall of a meta1 pan arounda reinforcing wire or rod of metal. However, 'it'is to be understoodthat my invention is not limited to the manufacture of pans. v

In producing metal pans, such as large rectangular baking pans, theflange or sidewall is formed with a curled edge so that an openwirereceiving channel of hook-shape cross-section is provided whichreceives the wire and which must be bent around the wire to completelyenclose it. My machine receives the partly formed pan with the wire inpositionin the channel and by means of relatively movable cooperatingmetal shaping dies, the walls of the channel are bent around the wire infirm embracing relationship therewith.

The preferred embodiment of my invention is illustrated in theaccompanying drawings wherein similar characters of reference designatecorresponding parts and wherein:

Fig. 1 is a side elevational view of a machine constructed according tomy invention.

Fig. 2 is a front elevational view of the upper portion of the machineshown in Fig. 1.

Fig. 3 is a top plan view, partly broken away, of the machine shown-inFigs. 1 and 2.

Fig. 4 is a vertical sectional view taken substantially along line 4-4of Fig. 3.

Fig. 5 is a partial and view of my machine.

Fig. 6 is a vertical sectional view taken substantially along line 6-6of Fig. 3 but showing the forming dies in their initial inoperativepositions rather than as in Fig. 3.

Fig. 7 is a view similar to Fig. 6 showing the forming. dies in. theirfinal operative positions as shown in Fig. 3.

Fig. 8, is an enlarged .detailin vertical section showing the formingdies intheir initial inoperative positions. 5 f

Fig. 9 is a View similarto Fig. 8 showing the forming dies in theirfinal operative "positions.

With reference to the drawings, I have illustrated a machine which isdesigned to receive a metal pan I of square or rectangular form whichmay be a metal baking pan. The panis shown in inverted position in Figs.6 to 9 and includes a flange or sidewall 2. The flange 2 has a turnededge 3 (Fig. 8) of hook -shape cross-section so as to form a channel 4for receiving a reinforcing wire or rod 5 of metal. My machine isadapted to bend the hook-shape edge 3 around the wire 5 into tightlyembracing relationship (Fig. 9) to the wire so as to retain it inposition on the flange.

My machine, as shown best in Figs. 1 to 3, comprises a table 6 or othersuitable support. This table includes the top plate I. which carriesmost of the mechanism of my machine. It also includes a supporting beam8 which is suitably connected to the legs of the table adjacent theirlower ends. The supporting beam 8 supports an upstanding cylinder andpiston unit .9, at the center of the table, which is secured thereto bymeans of bolts 10. The fluid-actuated cylinder and piston unit 9 iscontrolled by a suitable valve unit H which is disposed in front of thetable 6 and is actuated by a foot pedal 12. The valve II is connected tounit 9 by the lines l3 and I4. A source of fluid pressure is connectedto valve l I by a line [5.

The piston rod l6 of unit 9 extends upwardly therefrom and has pivotedto itsupper end, as at H, the lowerend of a link l8. The opposite end oflink I8 is pivoted within the yoke [9 (Fig. 3) formed on one end of alever 20. The opposite or rear end of lever 20 is pivoted, as at '2l,'to an upstanding support 22 which isa part of and at the rear end of aU-shape support 23 secured to the upper surface of the plate 1. Withinthe U-shape support 23 is a large .aperture 24 formed inplate 1 topermit the proper movement of link l8 and lever 20. When piston rod I6is in its uppermost position, the link 18 will be vertically disposed insubstantial alignment with rod l6 and the lever 26 will be in slightlyrearwardly inclined position, as indicated by the full lines in Fig. 1.When the piston rod [6 is in its lowermost position it'will bewithdrawnpractically completely'within the'unit 9 andthe link It andlever 26 will 'be sharply inclined downwardly and forwardly asindicated. by the-dotted lines in Fig.1.

bead on the pan. The cross section of this channel is slightly greaterthan a semi-circle andits center is at the axis of rotation of themember 51. The die 63 may be removed and replaced quickly with adie-having a different size channel if reinforcing wire of a diiferentsize is to beused. The radius of the channel will be that of thereinforcing wire plus the thickness of the metal of the flange of thepan. I

' In using my machine, the pan is inverted and placed over the inner die41 in the manner indicated in Figs. 6 and 8. The die 4'! will be in itsforwardmost position at this time so Ith'atthe flange of'the pan to bebent will have its hooked edge 3 resting on the shelf 45. 'At this time,the arms 55 will be in their rearwardmost position and the member 51will have been rotated clockwise to the extent of its movement. The wire5 will be in position in the channel 4 on the flange 2 of the pan l.

The pedal I2 is now actuated to cause the unit 9 to actuate themechanism of my machine. This will swing the shaft 28 and arms 30forwardly in the manner previously indicated. The shaft 3| will berotated and, consequently, the eccentrics 33 will be rotated and theyare so disposed on the shaft that a rear pull will be exerted on thelinks 34, causing the die 41 to move rearwardly towards the die 63. Aninstant after the die 41 is moved towards the die 63, the die 63 isrotated towards the die 41. This is accomplished by the shaft 28 which,when it is moved forwardly, engages the forward ends of slots 5| in arms50 and thereby swings arms 55 forwardly. However, this movement isdelayed until the movement of die 41 has started so that the rear edgeof die 41 will reach the rear edge of shelf 45 before the die 63 acts onthe edge 3 of the flange 2. This time interval may be adjusted byadjusting the bolts 53 on arms 50 and thereby, adjusting the effectivelengths of the slots 5|.

As the die 41 moves rearwardly, the edge 3 of the flange of the pan willbe slid rearwardly on the shelf 45 until it is completely oif the shelf.However, shortly before this happens the edge 3 of the flange is engagedby the hook-shape forming edge 68 of the die 63 and is bent forwardlyaround the wire 5. When the edge 3 is bent forwardly beyond the centerof the wire 5, the hookshape formin edge 68 serves to draw the edge 3into the channel 61 of the die 63. The die 4'! continues to move theflange 2 towards the die 63 which continues to rotate towards the flangeand by the time the edge 3 slides off the shelf 45, the turned edge 3 iscompletely supported within the channel 61. The die 63 will continue torotate until the edge 68 contacts the outer surface of the flange 2 asshown in Fig. 9, at which time the wire 5 will be firmly embraced by theturned edge 3. The die 41 reaches the extent of its rearward movementbefore rearward movement of links 34 is completed. As the links 34continue to move rearwardly a pull will be exerted on the bolts 36,thereby causing the springs 40 to be compressed. This will ensure thatthe dies 41 and 63 will be firmly but yieldingly pressed towards eachother during the formation of the flange of the pan disposedtherebetween. Consequently, as the rotation of die 63 nears its finalphase, it may move the die 41 forwardly slightly due to the yielding orresilient connection of plate 4| to links 34. The rear edge of plate 4|will not contact with the shelf 45 and thereby interfere with theyieding or resilient association of the dies 41 and 63 during theforming operation.

" WhenAthe-unit- 9 is actuated again to return the shaft 28 and arms 30to. their rearwardmost positions, the member 51 will be rotatedclockwise to its original position and the die 41 will be movedforwardlyto. its original position. Due to the provision of slots 5| in arms 50,rotation of member:5l will be delayed for'an instant until thedie'4'lstarts to move forwardly and exposes the shelf :45 for supportingthe flange 2 of the pan. The die carrying. member 51 is provided with acutaway lower edge 69 (Fig. 6) extending the full lengthethereof, toprevent interference with the lower corner of the rear edge of shelf 45as the member :5? is'rotated to its original position.

It will be apparent from theabove description thatuI-haveprovidedasimple machinewhich is very effective to form the edge of a relativelythin section of'metal around a reinforcing metal wire or rod. Aspreviously indicated, this invention is :not limited to the manufactureof pans but a pan hiSib6E11;ll-Sd merely as one example of work uponwhich this machine can be used.

.The inven'tion described herein may be manufactured and used by or forthe Government of the United States of America for governmental purposeswithout the payment of any royalty thereon or therefor.

What I claim is:

1. A metal forming machine for use on a metal section having a curlededge with a reinforcing wire disposed therein, comprising a structuralframework including a shelf for supporting said curled edge, asupporting die for engaging the surface of the metal section oppositethe curled edge, said die being movable relative to the edge of saidshelf, a forming die disposed along the edge of said shelf, saidsupporting and forming dies being supported upon said structuralframework, said forming die having a hook-shape forming edge along theside of an edge-receiving and forming channel which is formed therein,means for moving said supporting die towards the edge of said shelf,said moving being operative to bring the curled edge into associationwith said forming die, means for rotating said forming die towards saidsupporting die, and means operative during the rotation of said formingdie to cause the hookshape forming edge thereof to swing towards andengage said curled edge and to draw it into said channel as it bends itaround the wire, means including the movement of said supporting die forpushing said curled edge off said shelf, said curled edge being drawninto said channel before said curled edge is pushed off said shelf.

2. A structure according to claim 1 wherein said moving means for thedies includes a yielding connection so that the dies will yieldinglycooperate with each other.

3. A structure according to claim 1 wherein means is provided forcausing the means for moving the supporting die towards the edge of saidshelf to function shortly before the means for rotating the forming die.

4. A metal forming machine for use on a metal section having a curlededge with a reinforcing wire disposed therein comprising a structuralframework including a shelf for supporting said curled edge, asupporting die for engaging the surface of the metal section oppositethe curled edge, said die being movable relative to the edge of saidshelf, a forming die disposed along the edge of said shelf, saidsupporting and forming dies being supported upon said structural frame,said forming die having a hook-shape forming edge along the side of anedge-receiving and forming channel which is formed thereintn roakableshaft attached to said structural frame. eccentrics associated with saidrockahie shaft. means for moving said supporting die relative to theedge of said shelf, said means including links connected to saidrockable shaft by means of Sitid eccentrics, means for rotating saidforming (lie relative to said supporting die; said means includ ingrocking arms connected to said forming die. rocking arms for said shaft,and means-for making said die-actuating'arms and-said shaft actw atingarms, said last mentionedmeansincluding lost-motion linkage fordelaying'actuationof said die-rocking arms relative to. actuation 01said shaft rocking arms.

5. A structure according to claim 4 wherein said lost-motion linkage isadjustable tdvarythe time interval between actuation of the'die-rockinarms and the shafterocking arms.

6. A structure according to ciaim 4" wherein 29 8 REFERENCES CITED Thefollowing references are of record in the tile of this patent:

